MVC has never been implemented in Ext 2.3, as far as I know. I also think that it is not worth the effort as 2.3 is three versions back and it is really outdated today.
If you have a motivation and resources to upgrade the existing app then opt to update the app to Ext 5.x. It would be much better spent development time.
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lenlee
On
In Extjs4.x, the MVC appears for the first time. So it can't be used in previous versions. It becomes mvvm in Extjs5.x. I recommend you to learn Extjs4.x or Extjs5.x.
MVC has never been implemented in Ext 2.3, as far as I know. I also think that it is not worth the effort as 2.3 is three versions back and it is really outdated today.
If you have a motivation and resources to upgrade the existing app then opt to update the app to Ext 5.x. It would be much better spent development time.